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GOODWILL (Tables) | 3 Months Ended
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Mar. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in Carrying Amount of Goodwill | Changes in the carrying amount of goodwill for the three months ended March 31, 2023 and March 31, 2022 were as follows:
|  |  |  | Three months ended
|  |  |  | March 31,
(Dollars in thousands) |  |  |  |  |  | 2023 |  | 2022
Balance at beginning of period |  |  |  |  |  | $ | 1,001,507 |  |  | $ | 1,000,749 |
Goodwill resulting from business combinations |  |  |  |  |  | 4,231 |  |  | (790) |
Balance at end of period |  |  |  |  |  | $ | 1,005,738 |  |  | $ | 999,959 |
Finite-Lived Intangible Assets [Line Items] |
Schedule of Finite-Lived Intangible Assets [Table Text Block] |
(Dollars in thousands) |  | March 31, 2023 |  | December 31, 2022
|  | Gross carrying amount |  | Accumulated amortization |  | Gross carrying amount |  | Accumulated amortization
Core deposit intangibles |  | $ | 41,750 |  |  | $ | (27,215) |  |  | $ | 41,750 |  |  | $ | (26,488) |
Customer list |  | 69,563 |  |  | (15,981) |  |  | 69,563 |  |  | (14,457) |
Other |  | 10,960 |  |  | (4,253) |  |  | 14,079 |  |  | (7,064) |
Mortgage servicing rights |  | 21,623 |  |  | (5,278) |  |  | 21,347 |  |  | (4,811) |
Total |  | $ | 143,896 |  |  | $ | (52,727) |  |  | $ | 146,739 |  |  | $ | (52,820) |

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